title: 1,4-Bis(2-diazo-acet-yl)piperazine.
abstract: The asymmetric unit of the title compound, C8H10N6O2, contains one-half mol-ecule, which is completed by a crystallographic center of symmetry. The piperazine ring adopts a chair conformation. In the crystal, weak C-H⋯O inter-actions link the mol-ecules into layers parallel to the bc plane. The crystal packing also exhibits short N⋯N contacts of 3.0467 (16) Å between the terminal diazo N atoms from neighbouring mol-ecules.
authors.affiliation: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway.
authors.forename: Asmund
authors.initials: A
authors.lastname: Kaupang
authors.forename: Carl Henrik
authors.initials: CH
authors.lastname: Görbitz
authors.forename: Tore
authors.initials: T
authors.lastname: Bonge-Hansen